In the first post Mark Simmons said that "blowing halo to pieces would stop it from firing, but would it kill the flood?"
I think it could, wouldn't blowing the Halo into pieces destroy the Atrificial atmosphere, making everything still alive suffocate? The remaining pieces would becaome vaccums, as habitable as an asteroid. Even if the flood didn't breathe air, all it's food would die out and it would starve, right?